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a in (-oo:+oo)
(3/5)*a-(1/10) = 0
(3/5)*a-1/10 = 0
3/5*a-1/10 = 0 // + 1/10
3/5*a = 1/10 // : 3/5
a = 1/10/3/5
a = 1/6
a = 1/6
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